[Intel-gfx] [PATCH v2 2/2] drm/i915/guc: Allow for very slow GuC loading

[Dixit, Ashutosh]

On Thu, 16 Mar 2023 15:06:32 -0700, John.C.Harrison at Intel.com wrote:
>
> From: John Harrison <John.C.Harrison at Intel.com>
>
> A failure to load the GuC is occasionally observed where the GuC log
> actually showed that the GuC had loaded just fine. The implication
> being that the load just took ever so slightly longer than the 200ms
> timeout. Given that the actual time should be tens of milliseconds at
> the slowest, this should never happen. So far the issue has generally
> been caused by a bad IFWI resulting in low frequencies during boot
> (depsite the KMD requesting max frequency). However, the issue seems
> to happen more often than one would like.
>
> So a) increase the timeout so that the user still gets a working
> system even in the case of slow load. And b) report the frequency
> during the load to see if that is the case of the slow down.
>
> v2: Reduce timeout in non-debug builds, add references (Daniele)
>
> References: https://gitlab.freedesktop.org/drm/intel/-/issues/7931
> References: https://gitlab.freedesktop.org/drm/intel/-/issues/8060
> References: https://gitlab.freedesktop.org/drm/intel/-/issues/8083
> References: https://gitlab.freedesktop.org/drm/intel/-/issues/8136
> References: https://gitlab.freedesktop.org/drm/intel/-/issues/8137
> Signed-off-by: John Harrison <John.C.Harrison at Intel.com>

Tested this on ATSM and saw the interrmittent GuC FW load timeouts
disappear:

Tested-by: Ashutosh Dixit <ashutosh.dixit at intel.com>